Semtech SX1211-11SKA Manuel utilisateur
ADVANCED COMMUNICATIONS & SENSING
User’s Guide
SX1211-11SKA
SX1211-11SKA
User’s Guide: Advanced Mode
Revision 0.1 March 2009 © 2009 Semtech Corp. www.semtech.com
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ADVANCED COMMUNICATIONS & SENSING
User’s Guide
SX1211-11SKA
Table of Contents
1Introduction ................................................................................................................................................... 4
2Getting Started .............................................................................................................................................. 5
2.1 Kit Contents..................................................................................................................................................... 5
2.2 Installation....................................................................................................................................................... 5
2.3 SX1211SKA Overview.................................................................................................................................... 6
3Quick Start Guide.......................................................................................................................................... 7
3.1 SX1211SKA Quick Start (All Modes).............................................................................................................. 7
3.2 SX1211SKA Receive Mode Configuration...................................................................................................... 9
3.3 SX1211SKA Transmit Mode Configuration................................................................................................... 10
4SX1211SXA Software Description............................................................................................................. 11
4.1 Overview ....................................................................................................................................................... 11
4.2 File Menu....................................................................................................................................................... 11
4.3 Shortcut Buttons............................................................................................................................................ 12
4.4 Text Field Conventions for the SX1211SKA................................................................................................. 13
4.5 McParam Tab................................................................................................................................................ 13
4.6 Overview Panel............................................................................................................................................. 15
4.7 Register Hexadecimal Display...................................................................................................................... 15
4.8 The Mode Control Box.................................................................................................................................. 16
4.9 The IrqParam Tab......................................................................................................................................... 17
4.10 The RxParam Tab......................................................................................................................................... 17
4.11 The TxParam Tab ......................................................................................................................................... 19
4.12 The OscParam Tab....................................................................................................................................... 20
4.13 The Packet Test Tab..................................................................................................................................... 20
5Schematics and 2-Layer PCB Layout: SX1211SKA................................................................................. 23
6References................................................................................................................................................... 25
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SX1211-11SKA
Table of Figures
Figure 1. SX1211 Application Circuit .............................................................................................................................4
Figure 2. SX1211SKA Contents.....................................................................................................................................5
Figure 3. SX1211SKA Board Picture.............................................................................................................................6
Figure 4. SX1211 User Interface, Default Settings........................................................................................................7
Figure 5. The New SX1211 Configuration: Ready to be Written...................................................................................8
Figure 6. The SX1211SKA User Interface whilst in Packet Receiver Mode..................................................................9
Figure 7. The SX1211SKA User Interface Ready to Transmit the Demonstration Packet..........................................10
Figure 8. SX1211SKA GUI Overview and References to the User Guide Description of this Chapter.......................11
Figure 9. Example Text Editor Output of the SX1211 Configuration File ....................................................................12
Figure 10. SX1211 Local Oscillator Generation...........................................................................................................15
Figure 11. The Overview Panel....................................................................................................................................15
Figure 12. The Hexadecimal Register Display Summary............................................................................................16
Figure 13. The Mode Control Box also Incorporates RSSI.........................................................................................16
Figure 14. The Interrupt Mapping Display....................................................................................................................17
Figure 15. SX1211 Receiver Block Diagram, the Colours Correspond to the Frequency of Operation......................17
Figure 16. Receiver Parameter Display.......................................................................................................................18
Figure 17. SX1211 Simplified Transmitter Block Schematic Diagram.........................................................................19
Figure 18. The Transmitter Parameter Tab Display.....................................................................................................19
Figure 19. The Oscillator Parameter Display...............................................................................................................20
Figure 20. The Packet Receiver / Transmitter Test Display ........................................................................................21
Figure 21. Software Display: Successful Packet Mode Reception..............................................................................22
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ADVANCED COMMUNICATIONS & SENSING
User’s Guide
SX1211-11SKA
1 Introduction
The SX1211 is a single chip transceiver IC designed for operation in the European 868 MHz and U.S. 915 MHz
licence free ISM bands. The SX1211 is optimized for very low power consumption (3mA in receiver mode). It
incorporates a baseband modem with data rates up to 200 kb/s. Data handling features include a sixty-four byte
FIFO, packet handling, automatic CRC generation and data whitening. Its highly integrated architecture allows for
minimum external component count whilst maintaining design flexibility. All major RF communication parameters are
programmable and most of them may be dynamically set.
The SX1211SKA is a USB evaluation tool designed to allow simple and easy evaluation of the suitability of the
SX1211 for a given application. The low component count reference design implemented in the SX1211SKA is
shown below:
Figure 1. SX1211 Application Circuit
The SX1211 main features include:
¾Low Rx power consumption: 3mA
¾Low Tx power consumption: 25 mA @ +10 dBm
¾Good reception sensitivity: down to -107 dBm at 25 kb/s in FSK, -113 dBm at 2kb/s in OOK
¾Programmable RF output power: up to +12.5 dBm in 8 steps
¾Packet handling feature with data whitening and automatic CRC generation
¾Wide RSSI (Received Signal Strength Indicator) dynamic range, 70dB from Rx noise floor
¾Bit rates up to 200 kb/s, NRZ coding
¾On-chip frequency synthesizer
¾FSK and OOK modulation
¾Incoming sync word recognition
¾Built-in Bit-Synchronizer for incoming data and clock synchronization and recovery
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User’s Guide
SX1211-11SKA
2 Getting Started
2.1 Kit Contents
As illustrated in the figure below, the SX1230-11SKA Evaluation kit is composed of:
¾A pair of SX1211SKA boards
¾SX1211-11SKA CDROM including all necessary PC software and documentation
Figure 2. SX1211SKA Contents
2.2 Installation
SX1211SKA Advanced Mode Software Installation
1- Put the CDROM in your computer and browse the contents of the CD.
2- Open the “sx1211starterkitsetupweb.exe” manually. It can be found in the \Installers sub directory of the
CD-ROM.
3- Follow installation guidelines until the process is completed. Please note that .NET Framework 2.0 and the
FTDI USB driver will be automatically installed if not detected on your computer.
4- Connect the SX1211SKA board to the PC via the USB interface.
5- Launch “SX1211SKA” from the Start menu.
6- Click on “Connect” button in toolbar or in File menu.
7- SX1211SKA is now installed and ready to be used.
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2.3 SX1211SKA Overview
The SX1211SKA features the SX1211 reference design (1) and is also interfaced via an FTDI bridge (6) to the USB
type ‘A’ interface (5) of a host PC. Indication of transmission and reception is indicated on a pair of LEDs (4). A
Johanson Technologies ceramic antenna is employed (2) and optional provision for an SMA connector (not
populated) is provided for laboratory testing.
2
3
1
4
65
Figure 3. SX1211SKA Board Picture
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User’s Guide
SX1211-11SKA
3 Quick Start Guide
With the SX1211SKA software installed, follow the sequence below to establish communication between the one
SX1211SKA as transmitter and one SX1211SKA as receiver.
3.1 SX1211SKA Quick Start (All Modes)
1. Plug the SX1211SKA into the USB port of the computer.
2. Run the SX1211 User Interface software Start > All Programs > SX1211SKA > SX1211SKA
3. The SX1211SKA should connect automatically to the User Interface
Software. If not, then click on the USB connect short-cut button, located in
the top left hand corner of the window.
4. Once connected the SX1211SKA shows the default configuration of the SX1211 register settings
upon power-up.
Figure 4. SX1211 User Interface, Default Settings
5. Once connected the SX1211SKA shows the default configuration of the SX1211 register settings
upon power-up (as shown in Figure 4).
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User’s Guide
SX1211-11SKA
6. The settings for communication between transceiver kits are located on the
installation CD-ROM provided with the kit. Use the File > Open from the menu
bar, or the open short-cut button to load a configuration file.
7. Load the “XXX_SX1211_pingpong.cfg” file from the “SX1211 Demo Files” folder on the CD-ROM.
Where XXX corresponds to the frequency band of the SX1211SKA (either 868 or 915 MHz).
8. The display will then appear as shown in Figure 5.
Figure 5. The New SX1211 Configuration: Ready to be Written
9. By clicking on the write button in the ‘Registers config’ section, the
new register values are written to the SX1211 registers. If
successful, the red values in the hexadecimal register summary
table will turn black. As a double check, the register read button
may be pressed – the values presented on the user interface
should remain unchanged.
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User’s Guide
SX1211-11SKA
3.2 SX1211SKA Receive Mode Configuration
1. Click on the ‘Packet’ tab to access the packet testing portion of the program. Within this window a pre-
defined packet structure is already configured. It remains simply to click the ‘Reception’ radio button and
press the Start button. At this point the SX1211SKA enters packet receive mode and is now listening for
valid packets. At this juncture another SX1211SKA must be configured as transmitter.
Figure 6. The SX1211SKA User Interface whilst in Packet Receiver Mode
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User’s Guide
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3.3 SX1211SKA Transmit Mode Configuration
1. Repeat steps 1 to 9 of Section 3.1 with the second SX1211SKA provided in the kit. Then click on
the ‘Packet’ tab.
2. The packet test display is preconfigured in transmit mode with a valid payload (see Figure 7). The
‘Repeat value’ may be edited according to the number of packets desired to be transmitted (leave
equal to zero for continuous transmission).
3. Press the Start button. Packets will start to be sent, the ‘Tx Packets’ display indicating the number
of packets sent.
4. The successful reception of packets will be indicated in the ‘Rx packets’ window of the receiver
SX1211SKA.
Figure 7. The SX1211SKA User Interface Ready to Transmit the Demonstration Packet
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